William v



(No Model.)

W. V. ESMOND, PHOTOGRAPHIG SHUTTER.

No. 591,343]. Patented Oct. 5, 1897.

UNITED STATES WILLIAM V. ESMOND, OF NEW YORK, N. Y., ASSIGNOR TO PATENT OFFICE.

THE E. A; II. T.

ANTHONY & COMPANY, OF SAME PLACE.

SPECIFICATION forming part of Letters Patent No. 591,347, dated October 5, 1897.

Application filed May 11,1897- Serlal No. 686,011. (No model.)

The invention relates to the kind of shutter known as the pneumatic; and it consists in the construction and arrangement of the parts and their conjoint operation as hereinafter set forth.

In the drawings, Figure 1 illustrates a front elevation of the invention. Fig. 2 illustrates an endwise elevation; and Figs. it and 5 illustrate, respectively, separate diaphragms which when in use are detachably attached tothe shutter wing or slide.

A is the frame or casingof the shutter.

B is a slideway formed on the board or platen of the casing. i

G is the exposure-aperture in the platen.

D is the shutter wing or slide. It may be made of metal, rubber, celluloid, wood, or

v other suitable material.

v the piston.

E is the exposure-aperture in the'slide.

F is the pneumatieengine.

G is the bulb thereof, provided with the usual rubber tube H.

H is a hole in the bulb; I is the piston of the engine, to which the wing or slide D is attached by a connecting device J.

K is a stop pivoted, as seen at L, to the easing and adapted to be swung into the path of M is a bifurcated plate attached to the face of the slide at its rear part, having the bifurcated points NN free. They are of spring metal.

O O O are diaphragrns, each having a hole P in it. They differ in size.

The operation is as follows: For a time exposure the stop K is swung upwardly and held by the friction in its pivotal joint in a horizontal position. The bulb is then squeezed and the slide, under the action of the piston of theengine, is shot through the slideway B until the opening E in it coincides with the exposure-aperture in the platen of the shutter, and at this point the end of the piston comes in contact with the stop K, and the pressure on the bulb being continued the slide will be held in its then position for the desired time. Now upon allowing the bulb to expand the suction will cause the piston to move in the reverse direction and the slide will be returned to its normal position. To make an instantaneous exposure, the stop is swung downwardly out of the way of the piston, as shown in Fig. 2. The'bulb' is then squeezed and the slide passes quickly entirely across the exposure-aperture in the platen, and during the time that the exposure-apertures in the platen and in the slide coincide the picture is taken. The operator removes his thumb or the pressure of the ball of his I hand from the hole H in the bulb as soon as the slide has completed its'transit, so that there shall be no suction to retract the slide. When desired, however, the bulb may be again collapsed, and then the hole II in it being covered the suction on the expansion of the bulb will withdraw the slide to its normal position."

In order to regulate the brilliancy and quantity of the light entering the camera at the time of exposure, I provide small fiat pieces of rubber, metal, or other suitable material, (seen at'O O 0.) They are each perforated, as

shown, with a hole P of didering size and are adapted to be pressed under the free springact-in g ends N N of the clamp-plate M,and tlius held to the face of the wing or slideby the resiliency of the ends N N in such manner that the center of the holes in them shall coincide with the center of the exposure-aperture in the slide, and yet capable of easy removal therefrom when desired. I prefer to form a shallow groove a in the rear portion of these diaphragms, in which small projecting points I) b on the respective ends N N of the clamp plate M engage, the more securely to hold the 'diaphragms in position.

. 9 I do not limit myself to the details of conspring-plate attached to the wing, and a flat, gaging devices 011 the s1' 1ing- )1ut0 and dim,- perfomted diaphmgm adapted to be slipned phragm to aid in holding the latter to the under the spring-plum and held by its rcsilshutter-wing, [or the purposes sci; forLh.

iency against the face of the wing, for the Signed at New -fol-15in the ceunby of New 5 purposes set forth. York mu Pate of aw York, this 170th day 15 2. In. a, photographic shutter, a movable of May, A. 1891', wing provided with an exposurcflperture, a VYUJJAM V. '"SMUNI'L spring-plat!) attached to the wing, a flat, per- 'Vfitnosses: formed diaphragm adapted. to be slipped m1 F. S1 MISON,

w Ger the spring-plate, and interlonkhmmon- 1 A. I I%1'0 -:RI:-;ON. 

